US6001786A - Sulfurized phenolic antioxidant composition method of preparing same and petroleum products containing same - Google Patents
Sulfurized phenolic antioxidant composition method of preparing same and petroleum products containing same Download PDFInfo
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- US6001786A US6001786A US08/877,533 US87753397A US6001786A US 6001786 A US6001786 A US 6001786A US 87753397 A US87753397 A US 87753397A US 6001786 A US6001786 A US 6001786A
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
- C07C319/14—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of sulfides
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
- C07C319/22—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of hydropolysulfides or polysulfides
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K15/00—Anti-oxidant compositions; Compositions inhibiting chemical change
- C09K15/04—Anti-oxidant compositions; Compositions inhibiting chemical change containing organic compounds
- C09K15/12—Anti-oxidant compositions; Compositions inhibiting chemical change containing organic compounds containing sulfur and oxygen
- C09K15/14—Anti-oxidant compositions; Compositions inhibiting chemical change containing organic compounds containing sulfur and oxygen containing a phenol or quinone moiety
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/24—Organic compounds containing sulfur, selenium and/or tellurium
- C10L1/2406—Organic compounds containing sulfur, selenium and/or tellurium mercaptans; hydrocarbon sulfides
- C10L1/2412—Organic compounds containing sulfur, selenium and/or tellurium mercaptans; hydrocarbon sulfides sulfur bond to an aromatic radical
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- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/24—Organic compounds containing sulfur, selenium and/or tellurium
- C10L1/2462—Organic compounds containing sulfur, selenium and/or tellurium macromolecular compounds
- C10L1/2475—Organic compounds containing sulfur, selenium and/or tellurium macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon to carbon bonds
- C10L1/2481—Organic compounds containing sulfur, selenium and/or tellurium macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon to carbon bonds polysulfides (3 carbon to sulfur bonds)
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
- C10M135/20—Thiols; Sulfides; Polysulfides
- C10M135/28—Thiols; Sulfides; Polysulfides containing sulfur atoms bound to a carbon atom of a six-membered aromatic ring
- C10M135/30—Thiols; Sulfides; Polysulfides containing sulfur atoms bound to a carbon atom of a six-membered aromatic ring containing hydroxy groups; Derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
- C10M135/02—Sulfurised compounds
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
- C10M141/08—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic sulfur-, selenium- or tellurium-containing compound
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
- C10M2219/082—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
- C10M2219/087—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Derivatives thereof, e.g. sulfurised phenols
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
- C10M2219/082—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
- C10M2219/087—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Derivatives thereof, e.g. sulfurised phenols
- C10M2219/088—Neutral salts
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
- C10M2219/082—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
- C10M2219/087—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Derivatives thereof, e.g. sulfurised phenols
- C10M2219/089—Overbased salts
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/25—Internal-combustion engines
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/25—Internal-combustion engines
- C10N2040/251—Alcohol fueled engines
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/25—Internal-combustion engines
- C10N2040/255—Gasoline engines
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/25—Internal-combustion engines
- C10N2040/255—Gasoline engines
- C10N2040/28—Rotary engines
Definitions
- the present invention is directed to the use of 1-propanol as a solvent in the reaction of hindered phenols with sulfur.
- the use of 1-propanol as a solvent in the reaction of hindered phenols with sulfur is unique in that a product high in oligomer content is produced.
- the advantages of high oligomer contents are lower volatility, improved oil solubility, and the ability to produce a liquid product having a low sulfur content.
- the antioxidant compositions of the present invention exhibit excellent elastomer seal compatibility and improved corrosion properties.
- Antioxidants in the form of hindered, sulfur-bridged phenols having a branched alkyl group on the alpha carbon atom and made by reacting the phenol with sulfur dichloride in a solvent with recovery of a crystalline product from the reaction mixture are disclosed in U.S. Pat. No. 3,250,712.
- U.S. Pat. No. 4,946,610 discloses a liquid, sulfur-bridged, hindered phenol antioxidant composition that is prepared by reacting a mixture of hindered phenols with a sulfur chloride in the presence of a polar modifier.
- the composition is an effective antioxidant in lubricating oils without causing excessive copper corrosion.
- One of the objects of this invention is the preparation of an oil soluble, chlorine-free, sulfurized hindered phenolic antioxidant that is compatible with elastomer seals, does not cause excessive copper corrosion and is a highly effective antioxidant in low phosphorus ( ⁇ 1000 ppm phosphorus) lubricating oils used primarily in passenger cars and trucks.
- This invention relates generally to substantially liquid, chlorine-free, sulfur-bridged phenols useful as antioxidants and more specifically to the preparation of substantially liquid, chlorine-free, sulfur-bridged, hindered phenol compositions which are effective antioxidant(s) in lubricating oils and liquid organic fuels without damaging elastomer seals and causing excessive copper corrosion.
- the invention also includes lubricating oils and liquid organic fuels containing the hindered thiophenol antioxidant additive of the present invention, as well as a method of reducing oxidation in the lubricating oil and liquid organic fuel used in a machine such as an internal combustion engine.
- substantially liquid character refers to compositions that are chiefly liquid.
- aged samples of prior substantially liquid, chlorine-free, sulfur-bridged phenols do tend to form a slight amount of crystallization, generally around the sides of a container where product comes in contact with air and the glass container surface.
- more substantial crystallization is seen as a slight sediment at the bottom of the sample.
- the amount of crystallization is small but increases significantly with a small drop in sulfur content.
- the hindered phenols of Ser. No. 08/657,141 prepared with 0.43 parts of sulfur/1 part hindered phenol generally has only slight crystallization from aged samples at room temperature.
- a drop in sulfur content to 0.38 parts of sulfur/1 part hindered phenol gives significantly more crystallization.
- a higher sulfur content is expected to improve liquidity but would significantly hurt elastomer seal compatibility and copper corrosion characteristics.
- the antioxidant compositions of the present invention include antioxidant compositions comprising at least one thiophenol according to the following formula: ##STR1## wherein R is an alkyl group; wherein R 1 is selected from the group consisting of alkyl groups and hydrogen; wherein one of Z or Z 1 is OH with the other being hydrogen; wherein one of Z 2 or Z 3 is OH with the other being hydrogen; x is in the range of from 1 to 8; and y is in the range of from 0 to 2, and wherein the antioxidant composition is substantially free of chlorine, and wherein the antioxidant composition being in a substantially liquid form.
- the invention includes sulfur-bridged phenols referred to as thiophenols prepared in accordance with the general synthetic scheme: ##STR2## wherein R is an alkyl group; R 1 is selected from the group consisting of alkyl groups and hydrogen; R 2 is selected from the group consisting of alkyl groups and hydrogen; one of Z or Z 1 is OH with the other being hydrogen; one of Z 2 or Z 3 is OH with the other being hydrogen; x is in the range of from 1 to 8; and y is in the range of from 0 to 2.
- M may be selected from lithium, sodium, potassium, and cesium.
- the main advantage of this invention over that described in U.S. Pat. No. 4,946,610 is the use of a chlorine-free sulfur source and the preparation of a product with less unreacted 2,6-dialkylphenol.
- a further advantage is that the sulfurized hindered phenol product of the present invention is substantially chlorine-free which leads to improved corrosion properties.
- the present invention also includes lubricating compositions and liquid organic fuels containing a hindered thiophenol additive according to the present invention.
- the hindered thiophenol additive be present in the lubricating compositions or the liquid organic fuels in concentrations ranging from 0.005 to 5.0% by weight, preferably 0.01 to 2.0% by weight and most preferably from 0.3 to 2.0% by weight based on the total weight of the compositions.
- the lubricating composition and liquid organic fuel of the present invention may additionally comprise at least one composition selected from the group consisting of dispersants, detergents, antiwear additives, supplemental antioxidants, viscosity index improvers, pour point depressants, corrosion inhibitors, rust inhibitors, foam inhibitors, and supplemental friction modifiers, as appropriate to the desired application and as is appreciated in the art.
- the supplemental antioxidants may include those selected from the group consisting of diphenylamines, alkylated diphenylamines, phenyl-napthylamines, tert-butylphenols, sulfurized alkylphenols, sulfurized olefins, dithiocarbamates, oil soluble copper compounds, and oil soluble molybdenum compounds. It is presently believed that the use of supplemental antioxidants will become more common in the future. Thus, preferred compositions of the present invention include more than one antioxidant in addition to sulfurized hindered phenols of the present invention.
- Such lubricating compositions and liquid organic fuels may be formulated in accordance with practices known in the art using the additive of the present invention.
- the present invention also includes a method of reducing the oxidative environment in a petroleum composition selected from the group consisting of lubricating compositions and organic fuels, which method comprises adding to the petroleum composition an effective amount of the hindered thiophenol antioxidant composition according to the present invention.
- the present invention also includes a method of producing a substantially liquid sulfurized hindered phenol, said method comprising the steps: (a) preparing a mixture of: (i) at least two substantially chlorine-free hindered phenols; (ii) a substantially chlorine-free sulfur source; and (iii) at least one alkali metal hydroxide promoter; in 1-propanol; and (b) causing components (i), (ii) and (iii) to react for sufficient time and at sufficient temperature so as to form at least one chlorine-free sulfurized hindered phenol.
- the hindered phenol may be selected from the group consisting of: ##STR3## wherein R is selected from the group consisting of alkyl groups; R 1 is selected from the group consisting of alkyl groups and hydrogen; and R 2 is selected from the group consisting of alkyl groups and hydrogen. It is preferred that the R group and the R 1 group be selected from the group consisting of alkyl groups of 3 to 12 carbons and hydrogen, and most preferably from the group consisting of alkyl groups of 4 to 6 carbons and hydrogen.
- the hindered phenol may be selected from the group consisting of: 2-t-butylphenol, 2,6-di-t-butylphenol, 2,4-di-t-butylphenol, 2-sec-butylphenol, 2,6-di-sec-butylphenol, 2,4-di-sec-butylphenol, 2-isopropylphenol, 2,6-diisopropylphenol, 2,4-diisopropylphenol, 2-t-octylphenol, 2,6-di-t-octylphenol, 2,4-di-t-octylphenol, 2-cyclopentylphenol, 2,6-dicyclopentylphenol, 2,4-dicyclopentylphenol, 2-t-butyl-p-cresol, 2,6-di-t-amylphenol, 2,4-di-t-amylphenol, 6-t-butyl-o-cresol, 2,6-di-t-dodecylphenol,
- the sulfur source comprise elemental sulfur.
- the chlorine-free sulfurized hindered phenols of the present invention may be prepared by reacting a hindered phenol mixture with elemental sulfur in the presence of an alkali metal hydroxide promoter and 1-propanol.
- the reaction is preferably carried out at the reflux temperature of the 1-propanol (approximately 100° C.).
- a higher reaction temperature will increase the sulfurization yield and the trimer and tetramer content of the product, however, higher temperatures (e.g., 101-120° C.) will often require running the sulfurization reaction under pressure.
- the process produces alkali metal sulfide waste that may be separated from the product by washing with water. Separation of the aqueous and organic phases may be facilitated by the addition of a non-polar solvent. After the water washes, the non-polar solvent may be removed, yielding the substantially liquid sulfurized hindered phenol product.
- the sulfur source is substantially chlorine-free thus producing a chlorine-free sulfurized product.
- Use of a chlorine-free sulfur source also allows one to drive the reaction further to completion, i.e., reacting greater quantities of hindered phenol, while maintaining a low level of corrosion.
- reference to the product being substantially chlorine-free is intended to mean that the product is free of amounts of chlorine, in whatever oxidation state, that would cause copper corrosion in a given desired application.
- the number of bridging sulfur atoms between any two bridged phenolic rings can vary from 1 to 8.
- the process as described produces mostly bridges ranging from one to four sulfurs. Very small quantities of longer chained sulfur bridges, e.g. five, six, and seven, may be produced. Thus, products with low levels of unreacted hindered phenols can be made.
- An advantage of greater conversions in these reactions is that the products produced are less volatile, a property of practical importance in high temperature lubricant applications.
- Another advantage of the process and product of the present invention is that the products are rendered in substantially liquid form which greatly enhances their solubility as an additive, such as when placed in a base oil.
- the chlorine-free sulfurized hindered phenol product is an effective antioxidant in both conventional passenger car motor oils, i.e. oils containing approximately 1000 ppm phosphorus derived from ZDDP anti-wear additives, and low phosphorus passenger car motor oils, e.g. oils containing approximately 800 ppm phosphorus derived from ZDDP anti-wear additives.
- the process described in this invention produces a sulfurized hindered phenol product that has a number of advantages over sulfurized hindered phenols produced using different processes.
- the product produced is substantially liquid with very high solubility in oil.
- the product is substantially chlorine-free, is compatible with elastomer seals, including but not limited to nitrile rubber seals, and does not cause excessive copper corrosion.
- the product is a highly effective antioxidant in both conventional motor oils and low phosphorus motor oils as well as liquid organic fuels.
- the process for producing this chlorine-free sulfurized hindered phenol involves reacting a hindered phenol mixture with elemental sulfur in the presence of an alkali metal hydroxide promoter and 1-propanol.
- the hindered phenolic mixture used in this process should contain at least two different hindered phenols each having at least one hydrogen in the ortho or para position.
- Hindered phenols of this type are called reactive hindered phenols since at least one ortho or para hydrogen is available in the molecule for reaction with sulfur.
- hindered phenol is meant that the phenol is substituted in at least one ortho position with branched chain C 3 to C 12 alkyl groups and preferably a C 4 to C 6 alkyl group.
- suitable ortho-alkylphenols include: 2-t-butylphenol, 2,6-di-t-butylphenol, 2,4-di-t-butylphenol, 2-sec-butylphenol, 2,6-di-sec-butylphenol, 2,4-di-sec-butylphenol, 2-isopropylphenol, 2,6-diisopropylphenol, 2,4-diisopropylphenol, 2-t-octylphenol, 2,6-di-t-octylphenol, 2,4-di-t-octylphenol, 2-cyclopentylphenol, 2,6-dicyclopentylphenol, 2,4-dicyclopentylphenol, 2-t-butyl-p-cresol, 2,6-di-t-amylphenol, 2,4-di-t-amylphenol, 6-t-butyl-o-cresol, 2,6-di-t-dodecylphenol, 2,4-di
- Non-reactive hindered phenols may also be present to a minor extent in the hindered phenol mixture.
- non-reactive is meant a hindered phenol with no available hydrogens in the ortho or para positions of the phenol. These phenols are completely substituted at the reactive sites of the phenol aromatic ring and are thus not suitable for reaction with sulfur. Examples of such non-reactive hindered phenols include:
- Suitable hindered phenol mixtures contain 75 wt. % to 100 wt. % of a reactive hindered phenolic mixture containing two or more reactive hindered phenols, and from 0 wt. % to 25 wt. % of a non-reactive hindered phenolic mixture containing one or more non-reactive hindered phenols.
- the mixture preferably contains at least 60 weight % to 99 weight % of a di-ortho branched chain alkylphenol such as 2,6-di-tert-butylphenol, based on the total weight of hindered phenols used in the reaction.
- Concentrations of ortho-alkylphenol can range from 1 weight % to 30 weight %, preferably 9 weight % to 24 weight %, based on the total weight of hindered phenols used in the reaction.
- An example of a specific hindered phenolic mixture used in this invention contains 65 wt. % 2,6-di-tert-butylphenol and 22 wt. % ortho-tert-butylphenol as the reactive hindered phenol component, and 11 wt. % 2,4,6-tri-tert-butylphenol as the non-reactive hindered phenolic component.
- the hindered phenol mixture may be reacted with elemental sulfur in amounts based on the total reactive hindered phenolic content. Typically, a total of 0.20 to 0.40, preferably 0.28 to 0.38, most preferably 0.32 to 0.36, grams of elemental sulfur are used per gram of hindered phenolics used. Lower levels of sulfur produce less sulfur bridged hindered phenols and/or substantially solid products while higher levels of sulfur produce a more corrosive product. The physical form of the elemental sulfur is not critical.
- the alkali metal hydroxide used to promote the reaction may be any of the commercial alkali metal hydroxides, e.g. sodium hydroxide, potassium hydroxide, lithium hydroxide, cesium hydroxide.
- the amount of alkali metal hydroxide used typically is based on the total amount of hindered phenolics in the mixture.
- the concentration of alkali metal hydroxide may be in the range of 0.75 to 1.25 molar equivalents of hindered phenolic per molar equivalent of alkali metal hydroxide.
- a molar equivalent of alkali metal hydroxide is used for every molar equivalent of hindered phenolic.
- the alkali metal hydroxide content is determined as follows:
- the solvent used in the reaction is 1-propanol.
- the amount of solvent should be sufficient to dissolve the starting material and solubilize the sulfurized product.
- the hindered phenol mixture, elemental sulfur, alkali metal hydroxide, and 1-propanol are combined at room temperature and slowly warmed to reflux temperature.
- the reaction is carried out at reflux for 30 minutes to 3 hours.
- the order or rate of addition of the reagents is not critical, and the reaction time and temperature may be varied.
- the 1-propanol is removed by distillation. Vacuum may be applied in order to facilitate the removal of the last fractions of 1-propanol.
- the concentrated reaction mixture contains substantial amounts of various alkali metal sulfide salts that may be removed from the product by water washes. Generally, two to three water washes are sufficient to remove the salts with the last water wash containing a small amount of acid.
- a non-polar solvent may be added during the water washes to facilitate the separation of the organic product from the water phase.
- non-polar solvents include hexane, petroleum ether, ethyl ether, chloroform, methylene chloride, toluene, xylene, benzene, pentane, heptane, and octane.
- the product can also contain 10 to 25 percent of unreacted phenols which contain an ortho or para hydrogen.
- the non-reactive hindered phenols originally present in the starting material are unchanged in the reaction and remain in the product.
- the sulfurized hindered phenol product typically will be isolated as a high viscosity oil.
- the product can be used as is or may be diluted in a process or lubricating oil.
- Typical dilutions contain between 10 wt. % and 95 wt. % of the hindered sulfurized phenolic product with the remainder being one or more mineral or synthetic based lubricants.
- dilution is required to facilitate blending in regions where temperatures are low, e.g. arctic regions.
- the sulfurized hindered phenol products are added to lubricating compositions or liquid organic fuels in concentrations ranging from 0.005 to 5.0% by weight, preferably 0.01 to 2.0% by weight and most preferably from 0.3 to 2.0% by weight.
- the product is added to the oil or fuel in the form of an additive package concentrate.
- the amount of product in the concentrates generally varies from 0.5 to 50 weight percent or more.
- the concentrates may also contain other additives.
- crankcase oil is a formulated crankcase oil which is composed of between 75 and 90 wt. % of a mineral lubrication oil, between 0 and 10 wt. % of a polymeric viscosity index improver, and between 8 and 15 wt. % of an additive package.
- the additive package generally contains the following components:
- the dispersants typically are nonmetallic additives containing nitrogen or oxygen polar groups attached to a high molecular weight hydrocarbon chain.
- the hydrocarbon chain provides solubility in the hydrocarbon base stocks.
- the dispersants function to keep oil degradation products suspended in the oil.
- Examples of commonly used dispersants include copolymers such as polymethacrylates and styrenemaleinic ester copolymers, substituted succinamides, polyamine succinamides, polyhydroxy succinic esters, substituted mannich bases, and substituted triazoles.
- the dispersant may be present in the finished oil between 4.0 and 8.5% by weight.
- the detergents typically are metallic additives containing charged polar groups, such as sulfonates or carboxylates, with aliphatic, cycloaliphatic, or alkylaromatic chains, and several metal ions.
- the detergents function by lifting deposits from the various surfaces of the engine. Examples of commonly used detergents include neutral and overbased alkali and alkaline earth metal sulfonates, neutral and overbased alkali and alkaline earth metal phenates, sulfurized phenates, overbased alkaline earth salicylates, phosphonates, thiopyrophosphonate, and thiophosphonates.
- the detergents may be present in the finished oil between 1.0 and 2.5% by weight.
- the ZDDP's typically are the most commonly used antiwear additives in formulated lubricants. These additives function by reacting with the metal surface to form a new surface active compound which itself is deformed and thus protects the original engine surface.
- anti-wear additives include tricresyl phosphate, dilauryl phosphate, sulfurized terpenes and sulfurized fats.
- the ZDDP's also function as antioxidants. Generally, the ZDDP is present in the finished oil between 1.0 and 1.5 % by weight. It is desirable from environmental concerns to have lower levels of ZDDP.
- Supplemental antioxidants in addition to the sulfurized hindered phenols of this invention, may be used in oils that are less oxidatively stable or in oils that are subjected to unusually severe conditions.
- the supplementary antioxidants that are generally used include hindered phenols, hindered bisphenols, sulfurized phenols, alkylated diphenylamines, sulfurized olefins, alkyl sulfides and disulfides, dialkyl dithiocarbamates, phenothiazines, molybdenum compounds and copper salts.
- the inclusion of the sulfurized hindered phenols of this invention may eliminate the need for some of these supplementary antioxidants.
- the lubrication oil component of this invention may be selected from any of the synthetic or natural oils used as lubricants such as that for crankcase lubrication oils for spark-ignited and compression-ignited internal combustion engines, e.g. automobile and truck engines, marine and railroad diesel engines.
- Synthetic base oils may include alkyl esters of dicarboxylic acids, polyglycols and alcohols, poly-alpha-olefins, including polybutenes, alkyl benzenes, organic esters of phosphoric acids, and polysilicone oils.
- Natural base oils include mineral lubrication oils which may vary widely as to their crude source, e.g. as to whether they are paraffinic, naphthenic, or mixed paraffinic-naphthenic.
- the lubrication oil base stock conveniently typically will have a viscosity of about 2.5 to about 15 cSt, and preferably about 2.5 to about 11 cSt, at 100° C.
- the optional polymeric viscosity index improver (VII) component of this invention may be selected from any of the known viscosity index improvers.
- the function of the VII is to reduce the rate of change of viscosity with temperature, i.e. they cause minimal increase in engine oil viscosity at low temperature but considerable increase at high temperature.
- examples of viscosity index improvers include polyisobutylenes, polymethacrylates, ethylene/propylene copolymers, polyacrylates, styrene/maleic ester copolymers, and hydrogenated styrene/butadiene copolymers.
- supplemental additives that perform specific functions not provided by the main components.
- additional additives include, pour point depressants, corrosion inhibitors, rust inhibitors, foam inhibitors, and supplemental friction modifiers. Again, these additives are not always required but may be used in specific formulations that require them.
- the scrubber system was composed of the following traps placed in series past the condenser: a blank, 15 wt. % aqueous sodium hydroxide, and bleach.
- the reaction mixture was slowly heated with stirring to the reflux temperature of the solvent and held at that temperature for 1 hour. After the reaction period the reactor was equipped for distillation and the solvent removed. Distillation was continued until the reaction temperature reached 100 to 108° C. Residual solvent was then removed by vacuum distillation at 100° C. for 30 minutes. Water (215 g) was added to the slurry to dissolve the sodium polysulfide salts produced in the process.
- the two phase system was stirred at 80° C., the phases allowed to separate, and the bottom aqueous phase removed.
- the resulting organic product was diluted with 223.4 g of Calsol® 5550 naphthenic process oil from Calumet Lubricants Company, and an additional 215 g of water.
- the two phase system was again stirred at 80° C., the phases allowed to separate, and the bottom aqueous phase removed.
- the oil/product mixture was washed one final time at 80° C. with a mixture of water (215 g) and concentrated sulfuric acid (0.12 g). The phases were separated and the bottom aqueous phase was removed. Residual water was removed from the product under vacuum while holding the product temperature at 80° C.
- the product was then filtered through a pressure filtration apparatus using glass filter pads to collect residual insoluble material.
- the resulting product was weighed, and analyzed for sulfur content, viscosity at 40° C., and product distribution.
- a Gel Permeation Chromatography (GPC) method utilizing a U.V. detector was used to analyze the product distribution. It has been found that GPC gives useful information regarding the composition of sulfurized t-butylphenols. Peaks in a GPC trace represent molecular weight and/or molecular volume regions and not individual compounds. However, one can use individual compounds as standards to characterize the various molecular weight regions characteristic of a given sample. This has been done with the product distribution results reported in Table I below. The GPC results are reported in area % and are uncorrected for the presence of the diluent process oil.
- Reactions in this example were performed in a manner analogous to that described in Example I except that only HiTEC® 4733 (75 wt. % 2,6-di-t-butylphenol, 10 wt. % ortho-t-butylphenol, 13 wt. % 2,4,6-tri-t-butylphenol) was used as the source of t-butylphenols and the amount of sulfur used in the reaction was increased to give a sulfur/phenol ratio of 0.424.
- the resulting product was analyzed for sulfur content, viscosity at 100° C., and product distribution as defined in example I (GPC Method). Reaction conditions and analytical results are shown in Table II.
- the following example shows the improved nitrile seal compatibility of liquid sulfurized tert-butylphenols prepared with a low sulfur content using 1-propanol as the reaction solvent.
- Oil Sample B shows a borderline pass for the hardness rating in this seal compatibility test.
- the antioxidant used in oil sample B is highly crystalline and is therefore likely to cause handling problems in use. Even 50 wt. % oil dilutions of this sample have shown heavy crystallization after standing for short periods of time.
- a detriment in seal compatibility i.e. a shift in hardness rating from +3 to +5. It is desirable to have less of a detrimental shift.
- oil samples E through T blended with the low sulfur antioxidants described in this invention, show improved nitrile seal compatibility versus oil samples B through D, which are blended with the higher sulfur content antioxidants of Ser. No. 08/657,141.
- higher neat antioxidant treat levels and higher sulfur treat levels can be used and still yield passing hardness ratings.
- the antioxidants used in oil samples E through T are more compatible with nitrile seals and therefore more useful in crankcase lubricants.
Abstract
Description
______________________________________ 2,4,6-tri-t-butylphenol 4,6-di-t-butyl-o-cresol 2,6-di-t-butyl-p- cresol 2,4,6-tri-sec-butylphenol 4,6-di-sec-butyl-o-cresol 2,6-di-sec-butyl-p- cresol 2,4,6-tri-isopropylphenol 4,6-diisopropyl-o-cresol 2,6-diisopropyl-p- cresol 2,4,6-tri-t-amylphenol 2,4,6-tri-t-octylphenol 2-t-butyl-6-sec- butyl-p-cresol ______________________________________
______________________________________ 2,6-di-t-butylphenol 65 g/206.36 g/mole = 0.32 moles 2-t-butylphenol 22 g/150.24 g/mole = 0.15 moles 2,4,6-tri-t-butylphenol 11 g/262.48 g/mole = 0.04 moles Total = 0.51 moles phenol Total Alkali Metal = 0.51 moles Hydroxide Used sodium hydroxide Sodium Hydroxide 0.51 moles × 40.0 g/mole = 20.4 g ______________________________________
TABLE I __________________________________________________________________________ Preparation Of Sulfurized t-butylphenols With Low Sulfur Content and High Oligomer Content - Solvent Study Run/ H-4733 OTBP Sulfur Sulfur Visc. GPC* GPC* GPC GPC GPC GPC Sample Charge Charge Charge Solvent Yield Content (40° C., Tetramer Trimer Dimer TTBP DTBP MTBP # (g) (g) (g) Type (g) (wt. %) cSt) (area %) (area %) (area %) (area %) (area (area __________________________________________________________________________ %) 1 188.3 35.1 71 1-propanol 415 3 174 2.2 14.1 58.9 6.1 12.2 4.8 2 200 23.4 71 1-propanol 424 3 92 2.3 13.2 58.3 6.2 13.2 5.1 3 200 23.4 71 ethanol 432 3.3 274 0.3 6.5 72 5.7 6.8 7.2 4 200 23.4 71 2-propanol 437 3 182 0.3 4.6 67.7 6 9.7 10.2 5 188.3 35.1 80.6 1-propanol 426 3.9 219 1.7 16.9 60.4 5.6 9.3 4.8 6 200 23.4 80.6 1-propanol 425 3.7 199 0.7 11.3 67.7 6 9.7 3.3 7 211.7 11.7 80.6 1-propanol 437 3.8 228 0.5 9.6 70.7 6 9.1 2.6 8 200 23.4 80.6 ethanol 422 4 321 0.3 7.2 74.5 5.4 4.8 6.5 GPC Std. 100 GPC Std. 100 GPC Std. 100 GPC Std. 100 __________________________________________________________________________ HiTEC ® 4733 is a mixture of tbutylphenols composed of 75 wt. % 2,6di-t-butylphenol, 13 wt. % 2,4,6tri-t-butylphenol, and 10 wt. % ot-butylphenol which is available from Ethyl Corporation OTBP is otert-butylphenol available from Albemarle Corporation TTBP represents the tritert-butylphenol molecular region DTBP represents the ditert-butylphenol molecular region MTBP represents the monotert-butylphenol molecular region * Classification based on GPC retention times versus known standards GPC Dimer Std. is 4,4thiobis(2,6-di-t-butylphenol) GPC TTBP Std. is 2,4,6tri-t-butylphenol available from Aldrich Chemical Company GPC DTBP Std. is 2,6di-tert-butylphenol available from Ethyl Corporation GPC MTBP Std. is otert-butylphenol available from Albemarle Corporation
TABLE II __________________________________________________________________________ Preparation Of Sulfurized t-butylphenols With High Sulfur Content and High Oligomer Content - Solvent Study Reaction Sulfur Viscosity GPC* GPC* GPC Conv. Solvent Temp. Content (100 C, Tetramer Trimer Dimer TTBP DTBP MTBP By Run # Type (° C.) (wt. %) cSt.) (area %) (area %) (area %) (area %) (area %) (area GPC** __________________________________________________________________________ 9 1-propanol 99 5.4 0.5 10.6 74.2 5.4 6.5 1.4 85.3 10 1-butanol 100 4.6 7.7 0.2 5.3 65.8 5.8 16.1 4.6 71.4 11 1-pentanol 100 4.8 4.8 0.3 4.8 59.4 6.5 20.6 6 64.4 12 Ethanol 85 5.3 14 0.3 7.1 80.1 5.2 2.9 2.4 87.5 13 Isobutyl alcohol 104 5.2 7.5 0.4 6.6 67.7 5.6 13.6 4 74.7 GPC Std. 100 GPC Std. 100 GPC Std. 100 GPC Std. 100 __________________________________________________________________________ TTBP represents the tritert-butylphenol molecular region DTBP represents the ditert-butylphenol molecular region MTBP represents the monotert-butylphenol molecular region * Classification based on GPC retention times versus known standards ** Conversion By GPC is calculated from the sum of the Dimer, Trimer and Tetramer species GPC Dimer Std. is 4,4thiobis(2,6-di-t-butylphenol) GPC TTBP Std. is 2,4,6tri-t-butylphenol available from Aldrich Chemical Company GPC DTBP Std. is 2,6di-tert-butylphenol available from Ethyl Corporation GPC MTBP Std. is otert-butylphenol available from Albemarle Corporation
TABLE III __________________________________________________________________________ Allison C4 Nitrile Seal Compatibility Of Sulfurized Ter-Butyl Phenols Sulfur Content Of Conc. Sulfur Added Approximate Hardness Antioxidant Of To Oil By Activity Of Volume Change Change Oil Sample Antioxidant Antioxidant Antioxidant Passing Limits Passing Limits Sample Antioxidant (Wt. %) (Wt. %) (Wt. %) (Wt. %) (-1.50 to +6.00) (-5 to __________________________________________________________________________ +5) A t-Butylphenols.sup.1 0 0.9 0 100 +1.65 +3 B Comparative Sample.sup.2 4.17 1.2 0.050 50 +2.66 +5 C Comparative Sample.sup.3 10.34 0.3 0.031 100 +1.96 +6 D Comparative Sample.sup.3 10.34 0.5 0.052 100 +2.46 +7 E Sample 1 2.97 0.4 0.012 46 +0.84 +4 F Sample 1 2.97 0.8 0.024 46 +1.16 +5 G Sample 1 2.97 1.2 0.036 46 +1.45 +5 H Sample 1 2.97 1.6 0.048 46 +1.63 +5 I Sample 2 3.01 0.4 0.012 47 +1.23 +2 J Sample 2 3.01 0.8 0.024 47 +1.55 +3 K Sample 2 3.01 1.2 0.036 47 +1.83 +4 L Sample 2 3.01 1.6 0.048 47 +2.01 +4 M Sample 5 3.93 0.4 0.016 47 +1.41 +6 N Sample 5 3.93 0.8 0.031 47 +1.70 +4 O Sample 5 3.93 1.2 0.047 47 +2.22 +4 P Sample 5 3.93 1.6 0.063 47 +2.08 +6 Q Sample 6 3.70 0.4 0.015 47 +1.85 +4 R Sample 6 3.70 0.8 0.030 47 +2.21 +3 S Sample 6 3.70 1.2 0.044 47 +2.56 +3 T Sample 6 3.70 1.6 0.059 47 +2.81 +6 __________________________________________________________________________ .sup.(1) HiTEC ® 4733, available From Ethyl Corporation, contains 75 wt. % 2,6di-t-butylphenol, 13 wt. % 2,4,6tri-t-butylphenol, and 10 wt. % orthot-butylphenol. .sup.(2) Prepared as described for Sample B, Example VI in 08/657,141. .sup.(3) Prepared as described for Sample A, Example VI in 08/657,141.
Claims (30)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
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US08/877,533 US6001786A (en) | 1997-02-19 | 1997-02-19 | Sulfurized phenolic antioxidant composition method of preparing same and petroleum products containing same |
EP98300959A EP0866112B1 (en) | 1997-02-19 | 1998-02-10 | Sulfurized phenolic antioxidant composition, method of preparing same, and petroleum products containing same |
DE69800105T DE69800105T2 (en) | 1997-02-19 | 1998-02-10 | Phenolic antioxidant composition containing sulfur, process for its preparation and petroleum products containing it |
CA002229721A CA2229721A1 (en) | 1997-02-19 | 1998-02-16 | Sulfurized phenolic antioxidant composition, method of preparing same, and petroleum products containing same |
JP05125098A JP3332843B2 (en) | 1997-02-19 | 1998-02-18 | Sulfurized phenolic antioxidant composition, method for producing the same, and petroleum products containing the same |
CN98107053A CN1092700C (en) | 1997-02-19 | 1998-02-18 | Sulfurized phenolic antioxidant composition, method of preparing same, and petroleum products containing same |
SG1998000364A SG72791A1 (en) | 1997-02-19 | 1998-02-19 | Sulfurized phenolic antioxidant composition method of preparing same and petroleum products containing same |
KR10-1998-0005175A KR100492349B1 (en) | 1997-02-19 | 1998-02-19 | Sulfurized phenolic antioxidant composition, method of preparing same, and petroleum products containing same |
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US08/877,533 US6001786A (en) | 1997-02-19 | 1997-02-19 | Sulfurized phenolic antioxidant composition method of preparing same and petroleum products containing same |
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US6001786A true US6001786A (en) | 1999-12-14 |
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US (1) | US6001786A (en) |
EP (1) | EP0866112B1 (en) |
JP (1) | JP3332843B2 (en) |
KR (1) | KR100492349B1 (en) |
CN (1) | CN1092700C (en) |
CA (1) | CA2229721A1 (en) |
DE (1) | DE69800105T2 (en) |
SG (1) | SG72791A1 (en) |
Cited By (4)
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---|---|---|---|---|
US6548462B1 (en) * | 1998-11-03 | 2003-04-15 | Nematel Dr. Rudolph Eidenschink | Bisphenyl thiocompounds |
US20040198615A1 (en) * | 2003-04-04 | 2004-10-07 | The Lubrizol Corporation | Di-secondary alkyl hindered phenol antioxidants |
US20050202980A1 (en) * | 2004-03-10 | 2005-09-15 | Loper John T. | Novel additives for lubricants and fuels |
US7645728B2 (en) | 2004-02-17 | 2010-01-12 | Afton Chemical Corporation | Lubricant and fuel additives derived from treated amines |
Families Citing this family (2)
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KR20140108280A (en) * | 2011-12-27 | 2014-09-05 | 셰브런 오로나이트 컴퍼니 엘엘씨 | Post-treated sulfurized salt of an alkyl-substituted hydroxyaromatic composition |
CN107227195B (en) * | 2017-06-06 | 2020-04-07 | 江苏司能润滑科技有限公司 | Diesel engine oil and preparation method thereof |
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US6548462B1 (en) * | 1998-11-03 | 2003-04-15 | Nematel Dr. Rudolph Eidenschink | Bisphenyl thiocompounds |
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US7645728B2 (en) | 2004-02-17 | 2010-01-12 | Afton Chemical Corporation | Lubricant and fuel additives derived from treated amines |
US20050202980A1 (en) * | 2004-03-10 | 2005-09-15 | Loper John T. | Novel additives for lubricants and fuels |
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Also Published As
Publication number | Publication date |
---|---|
KR19980071513A (en) | 1998-10-26 |
CN1092700C (en) | 2002-10-16 |
JPH11228955A (en) | 1999-08-24 |
CA2229721A1 (en) | 1998-08-19 |
DE69800105D1 (en) | 2000-05-04 |
DE69800105T2 (en) | 2000-08-24 |
EP0866112B1 (en) | 2000-03-29 |
KR100492349B1 (en) | 2005-09-08 |
JP3332843B2 (en) | 2002-10-07 |
EP0866112A1 (en) | 1998-09-23 |
SG72791A1 (en) | 2000-05-23 |
CN1224748A (en) | 1999-08-04 |
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